Szymon Rybczak

Szymon Rybczak co-founded and leads TesterArmy, building agentic testing for web and mobile software. Previously, he developed React Native tooling at Callstack and maintained open-source libraries including React Native Community CLI and React Native AI.

Career

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Based in: San Francisco
Elsewhere

TesterArmy

Until Present

Co-founder & CEO

Callstack

Nov 2022 — Jan 2026

Senior React Native Developer

MyMusic

Sep 2021 — Nov 2022

React Native Developer

LiveKid

Mar 2021 — Jul 2021

Mobile Developer

Products & media

github.com

React Native AI

An open-source library he maintained for running AI models on mobile devices, with Vercel AI SDK compatibility.

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Szymon Rybczak

TesterArmy

Callstack

MyMusic

LiveKid

Products & media

React Native AI

Curated Lists

List Inclusions